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利用2005-2007年OMI（OzoneMonitoringInstrument）卫星的气溶胶指数AI（AerosolIn-dex），分析了沙尘传播的特征。结果表明，蒙古戈壁与北美西海岸地区（40°-50°N，120°-130°w）的AI指数之间有较高的相关性，两地具有源区和被影响区的关系。通过计算沙尘传播时间的滞后相关系数，得到从蒙古戈壁到美国西海岸的沙尘传播时间约为6-7天，且通过了99％信度。利用滞后相关系数，获取了沙尘传播信号，并对沙尘的远距离传播进行了预报。“,”The characteristic of long-distance sand-dust transport from Asia to United States over the Pacific Ocean is statiscally analyzed using OMI AI data during 2005-2007. The results show that there is a higher correlation of AI between Mongolia Gobi and west coast of the United States region（40°-50°N, 120°-130°E ）, and both are of relationship of a source and impacted area. Through the lag correlation co- efficient of the calculated sand-dust propagation time, the sand-dust propagation time from Mongolia Gobi to west coast of United States is obtained to be about 6-7 days, which has passed the confident level of 99%. Based on the relationship of source and impacted area, the sand-dust propagation signals are ob- tained using the lag correlation coefficient, which has been forcasted the long-distance propagation of sand- dust.